2020A&A...641A..44M


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.04CET23:42:39

2020A&A...641A..44M - Astronomy and Astrophysics, volume 641A, 44-44 (2020/9-1)

The Infrared Telescope Facility (IRTF) spectral library. II. New indices in Y, J, H, and L atmospheric windows.

MORELLI L., IVANOV V.D., PIZZELLA A., GASPARRI D., COCCATO L., CORSINI E.M., DALLA BONTA E., FRANCOIS P. and CESETTI M.

Abstract (from CDS):


Context. Stellar population studies in the infrared (IR) wavelength range have two main advantages with respect to the optical regime: they probe different populations, because most of the light in the IR comes from redder and generally older stars, and they allow us to see through dust because IR light is less affected by extinction. Unfortunately, IR modeling work was halted by the lack of adequate stellar libraries, but this has changed in the recent years.
Aims. Our project investigates the sensitivity of various spectral features in the 1-5µm wavelength range to the physical properties of stars (Teff, [Fe/H], logg) and aims to objectively define spectral indices that can characterize the age and metallicity of unresolved stellar populations.
Methods. We implemented a method that uses derivatives of the indices as functions of Teff, [Fe/H] or logg across the entire available wavelength range to reveal the most sensitive indices to these parameters and the ranges in which these indices work.
Results. Here, we complement the previous work in the I and K bands, reporting a new system of 14, 12, 22, and 12 indices for Y, J, H, and L atmospheric windows, respectively, and describe their behavior. We list the equivalent widths of these indices for the Infrared Telescope Facility (IRTF) spectral library stars .
Conclusions. Our analysis indicates that features sensitive to the effective temperature are present and measurable in all the investigated atmospheric windows at the spectral resolution and in the metallicity range of the IRTF library for a signal-to-noise ratio greater than 20-30. The surface gravity is more challenging and only indices in the H and J windows are best suited for this. The metallicity range of the stars with available spectra is too narrow to search for suitable diagnostics. For the spectra of unresolved galaxies, the defined indices are valuable tools in tracing the properties of the stars in the IR-dominant stellar populations.

Abstract Copyright: © ESO 2020

Journal keyword(s): infrared: stars - line: identification - stars: abundances - supergiants - stars: late-type - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/641/A44): tablee1.dat tablee2.dat tablee3.dat tablee4.dat tablee5.dat tablee6.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 6130 ** 01 03 37.00525 +61 04 29.3612   6.55 6.01 7.04   F0II 62 0
2 * phi Cas s*y 01 20 04.9146181556 +58 13 53.812633124 6.15 5.66 4.98 4.34 3.78 F0Ia 256 0
3 * 14 Ari PM* 02 09 25.3249845242 +25 56 23.416316591   5.318 4.977     F2III 97 0
4 HD 26015 ** 04 07 41.98340 +15 09 46.0260           F3V 145 0
5 * h Tau dS* 04 19 57.7045549280 +14 02 06.739482030   5.856 5.568 5.407 5.250 F0IV 208 0
6 * 1 Mon dS* 05 59 01.0804535741 -09 22 56.007927198   6.46 6.16     F2/3IV 143 0
7 * zet Leo V* 10 16 41.4159679 +23 25 02.322080 3.89 3.72 3.41 3.09 2.91 F0IIIa 218 0
8 HD 108519 * 12 27 46.2967071192 +27 25 21.934584785   7.96 7.69     F0V(n) 32 0
9 * 78 UMa ** 13 00 43.69949 +56 21 58.8102   5.29 4.93     F2V 267 1
10 * i Lup * 15 14 37.3210410015 -31 31 08.843368128   5.273 4.918     F3III 96 0
11 HD 173638 Ir* 18 46 43.3244589931 -10 07 30.169706972 6.7 6.285 5.717     F0IV 63 1
12 HD 213135 PM* 22 29 46.0543412659 -27 06 26.142280965   6.28 5.95     F0V 51 0

    Equat.    Gal    SGal    Ecl

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2020.12.04-23:42:40

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